- J.P. Instruments
 - Santa Ana - Manufacturer of engine data management systems including navigation, scanners, fuel flow, and more. - Sabritec
- Irvine - Manufacturer of special connectors, cable assemblies, and filter connectors.
- Mexmil Company, The
- Santa Ana - Manufactures thermal and acoustical insulation systems for the aerospace industry.
- Adams Rite Aerospace, Inc.
- Fullerton - Manufacturer of components for both the commercial and military aircraft industry.
- Kaiser Electroprecision
- Irvine - Providing aerospace parts and equipment, such as actuators, missiles, pilot controls, and Rollmet seamless steel pipes.
- General Kinetics
- Lake Forest - Provides research and development of hydrogen peroxide gas generators, rocket engines, and catalysts for propulsion and power systems.
- Seco Seals
- Costa Mesa - Gasket inventor and manufacturer.
- Wyvern Technologies
- Santa Ana - Build to print high reliability electronics components for aerospace and defence contractors.
- Romstar Engineering
- Anaheim - Specialises in the making of parts for the aerospace industry.
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